Automatic exposure devices and Phototiming

A hollow cell that contains air and is connected to the timer circuit via an electrical wire

Refers to the shortest exposure time that the system can produce

AEC devices equipped with these that allow the radiographer to adjust the amount of preset radiation detection values

The AEC system is designed to compensate for changes in an area of interest depending on this

Measures the exposure to the receptor

Reports the actual mAs used for an exposure

Radiographer will increase this value so that the time of exposure terminates more quickly

-2, -1, +1, and +2

This condition can cause underexposure of the area of radiographic interest

Radiation is transmitted through the patient and converted into an electrical signal, terminating the exposure time

The most common cause for repeating images done with film-screen and AEC

The maximum exposure time the x-ray exposure will continue when using an AEC system

Is a common percentage increment that the predetermined exposure level

Factors related to the patient affect the time of exposure reaching the IR and ultimately image quality

Phototimers and ionization chambers

Only controls the quantity of radiation reaching the IR

These are the percentages the backup time should be set at

Is to be used for a particular examination that is critical when using the AEC system

excessive or insufficient of _________ may affect the amount of exposure reaching the IR

An electronic device that converts visible light energy into electrical energy

Radiographers must set this value as needed to ensure adequate penetration and to produce the appropriate level of contrast?

This allows the properly used AEC system to terminate the exposure appropriately

_____________ may result in the visibility of quantum noice and ____________ increases patient exposure and may decrease contrast

These two tests are essential procedures to maintain the proper functioning of the AEC system